Bulb



FIG. 1 is a top, front and right side perspective view of a bulb showingmy new design;

FIG. 2 is a front elevational view thereof, with the rear being a mirrorimage;

FIG. 3 is a right side elevational view thereof, the left side being amirror image;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The ornamental design for a bulb, as shown and described.